Signaling device



Nov. 10, 1931. K. L. scoTT SIGNALING DEVICE Filed June 20, 1929 m C mm #5 WA mr M. K 5

Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE NEW YORK KENNETH LOYAL SCOTT, OF WESTERN SPRINGS, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF

SIGNALING DEVICE Application filed June '20,

This invention relates to signaling devices, and more particularly to signaling devices used in telephonic communlcatlon circuits.

An object of the invention is to provide a signaling device which will be composed of a minimum number of parts and which will be eflicient and economical to construct.

The invention contemplates the provision, in a biased polarized telephone ringer, of a single electromagnetic coil having a folded laminated magnetic core, and a similar folded laminated member placed adjacent to a permanent magnet, the latter folded member being attached to a troughlike supporting member integral with'the frame of the ringer.

It is believed that a better understanding of the invention may be had by referrlng to the following specification, read in connection with the accompanying drawings, forming a partthereof, in which Fig. 1 is an elevation of a telephone ringer embodying the, features of the invention;

'Fig. 2 is a section taken on the line 2-2 of Fig. 1, and

Fig. 3 is a side elevation of the ringer. Referring to the drawings in which similar parts are indicated in the several views by identical reference numerals a telephone ringer or signaling device, indicated generally by the numeral 10, includes a framework 11,'consisting of an upper spacing bridge '12 composed of mild steel or other suitable material and a lower iron heel member 14, rigidly secured together at their 8X1 tremities upon right and left hand brass side posts 1515. The upper ends of the side posts 15-15 are threaded and provided with brass screws 16-16 for regulating the distance between the bridge 12 and the heel member 14. The bridge 12 is provided at the central portions thereof with oppositely disposed apertured-tongues 18-18 containing bearings for cooperating pivot screws 19 and 20, which bear against the lateral edges of a soft iron armature 21 to permit its partial rotation therearound. The pivot screws 19 and 20 are each provided with slotted heads by means of which the position of the screws may be readily varied to regulate the 1929. Serial No. 372,317.

NEIV YORK, N. Y., A CORPORATION OF pressure of the screws against the armature The armature 21 comprises a part of a clapper mechanism of the ringer and its partial rotation is controlled by a biasing device consisting in part of a normally stationary split shaft set pin 23 which is rotatably mounted in an aperture in the left hand side post 15, and provided with a slotted head 24 to permit its adjustment. The bridge 12 is provided at a point approximately midway between the right hand side post 15 and the center of the bridge with a set screw 25, which projects therethrough for the purpose of limiting the rotation of tle armature 21. The armature 21 is provided at the left end thereof with an arm 27, rigidly mounted therein having a hooked end which isengag-ed by the upper end of a biasing spring 28, to the lower end of which is secured a cord 29. By winding the cord 29 about the pin 23 when the latter is rotated, the tension exerted by the spring 28 to control the rotation of the armature may be regulated. A tappet 31 carrying a ball or other type of hell clapper is rigidly mounted in and projects from the center of the armature 21, in such manner as to be pivotable therewith about the pivot screws 19 and 20.

An electromagnetic means for operating the apparatus described above includes a coil. 32, composed of turns of wire upon a folded laminated core 33, of iron or other suitable magnetic material of integral construction, and two fibrous spool heads 34-3 l. The core 33 is mounted upon the heel member 14, preferably perpendicularly thereto, by a threadedboit 35 which projects through an aperture in theheel plate and engages longitudinally the interior of the core 33. A similar fold-ed laminated and integral member extends parallel with the core 33, and is secured in position adjacent to the midpoint of the armature 21 by a rectangular tab which is struck up from the body. of the heel memher 1% near the midpoint thereof, partially severed and bent to form a V-shaped troughiil-ze bracket member 37. The laminated member 36 is secured within the trough-like member 37 by a threaded screw 39 which extends ture 21 to the core 33.

transversely through the laminated member 36 and engages the trough-like member 37. As shown in the drawings, the; projecting end of the screw 39 is treated to remove the sharp corners therefrom. At the right end of the armature'2l on a line with the center line of the laminated core 33 is an anti-freezing disk 40, composed of brass or other suitable material, for preventing the armature from adhering to the adjacent end of the laminated core 33 when it is attracted thereto. Rigidly secured to the under surface of the heel member 14 by a threaded bolt 41 and a retaining washer 43 is a permanent magnet 44, com.- posed of cobalt steel or other suitable material, extending. perpendicularly to the heel member 14 in such manner that its poles project beyond the ends of the folded laminated member 36. The coil 32 is provided with terminal members 46 and 47 by means of which the coil winding may be connected to a suitable source of pulsating direct electrical current (not shown).

From the oregoing it will be observed that if the end of the permanent magnet 44 adjacent the bridge 12 be a north pole, the fiux field will be such that a magnetic flux will always be directed therefrom along the laminated member 36 across the heel member 14 to the other end of the permanent magnet, which becomes the south pole, and thence return along the permanent magnet to the north pole. At'the same time an appreciable share of the flux will cross the gap between the bridge 12 and the armature 21 at the right end of the latter, follow the core 33 to the heel member 14 and thence be returned through the permanent magnet to the north pole thereof. Sincethe laminated member 36 is located directly beneath the center of the armature 21, it is ineffective to cause the armature to rotate in either direction. However, under such conditions a pull of appreciable magnitude is normally exerted upon the right end of the armature 21 to cause it to tend to rotate clockwise about the pivot screws 19 and 20 in the direction of the laminated core 33. By adjustment of the set pin 23, the tension upon the biasing spring 28 is increased to an extent which will balance and resist.

the pull in the direction of the laminated core 33. When, however. the terminal 46 is.

connected to the source of power and pulsating direct current flows through the coil 32 at the end of the core 33 adjacent the armature, the quantity of flux is there augmented, overcoming the tension in the biasing spring 28 and causing the attraction of the arma- Since the pulsating current flowing in the coil is so regulated that the effective augmentation of the flux across the gap between the south pole of the core 33 and the armature 21 occurs only at the crest 7 of a sine wave representative of the current pulsations, a continuous and regular vibration of the armature 21 is secured as long as the current exists in the coil 32. When the current in the windings of the coil 32 is reversed, the action is reversed, and the armature 21 is repelled from the adiacent end of the core 33 and held in position against the set screw 25 to prevent its vibration, or the attractive force pulsates with its maximum value always less than the amount required to attract the armature against the tension of the spring 28.

Although the ringer described is principally used for party line ringing upon a pulsating direct current line, it is obviously capable of advantageous use when connected with a source of alternating current.

By constructing the core 33 and the parallel member 36 of integral folded laminations it has been possible to employ the above described mechanism without material departure from customary and desirable impedances at voice frequencies, and without necessitating any substantial redesign of associated apparatus.

Although the above describes only one embodiment of the invention in a single coil biased polarized telephone ringer, it should be understood that the scope of the invention should not be limited by the specific s ructure, disclosed, but only by the scope of the appended claims.

What is claimed is:

1. A signaling device including a permanent magnet, a coil, a folded laminated core for the coil extending parallel with the flux field of the permanent magnet, and a folded laminated member extending between the poles of a permanent magnet.

2. A signaling device including a coil, a folded laminated core within the coil, 0. permanent magnet, and a member extending between the poles of the permanent magnet parallel with the core of the coil.

3. A. signaling device including means for producing a magnetic flux, and a plurality of separated folded laminated means for concentrating the magnetic flux.

4. A signaling device including means for producing a magnetic flux, a plurality of" folded laminated means for concentrating the magnetic flux, a framework, and bracket means associated with the framework for v d I supporting one of the folded laminated in such a direction as to produce a south pole means.

5. Asignaling device including a permanent magnet, a magnetic field and a folded laminated magnetic member supported between the poles of the magnet and independent of said coil.

6. A signaling device including a framework, a permanent magnet having associated therewith a folded laminated member and a coil. having a. folded laminated core, means for supporting the magnet, and means on the framework for supporting the associated elements.

7. A signaling device including a framework, a permanent magnet supported thereon, a folded laminated member, and bracket means integral with the framework for supporting the folded laminated member between the poles of the magnet.

8. A signaling device including a frame- 19 work, a permanent magnet having associated therewith a folded laminated member, a coil having a folded laminated core, means for supporting the magnet, and bracket means integral with the framework for supporting the folded laminated member.

9. A signaling device including a permanent magnet, a rotatable armature, a coil having a folded laminated core, and means extending between the poles of the permanent magnet for increasing the impedance of the signaling device;

10. A signaling device including a permanent magnet, a rotatable armature, a coil having a folded laminated core, and means extending between the poles of the permanent magnet for increasing the impedance of the signaling device without affecting the armature.

In witness whereof, I hereunto subscribe 39 my name this 8th day of June A. D., 1929.

KENNETH LOYAL SCOTT. 

